How to write log in wordpress from child theme.

debug.php

// add in child theme function.php
// For more info : https://codex.wordpress.org/Debugging_in_WordPress
// Step 1 : define( 'WP_DEBUG', true );
// Step 2 : define( 'WP_DEBUG_LOG', true );
// Step 3 : Paste the below code in child theme function.php
// Step 4 : Call the function as : hb_write_log('lets debug');
// Step 5 : See the logs @ /website-entry-point/wp-content/debug.log ( if there is no file create a one with same name.)

if (!function_exists('hb_write_log')) {
    function hb_write_log($log) {
         if (true === WP_DEBUG) {
            if (is_array($log) || is_object($log)) {
                error_log(print_r($log, true));
            } else {
                error_log($log);
            }
        }
    }

}
// call like below.
hb_write_log('lets debug')